Attractive Force of Spherical Capacitors

If a capacitor is composed of two isolated conductors, after charging the oppositely charged plates will experience a Coulombic attraction. Given a spherical capacitor of inner radius aa and outer radius bb, find the attractive force exerted on the outer conductor assuming that each conductor holds charge ±Q\pm Q.

Assume the conductors are mechanically held fixed, so the force is constant in time, and let negative forces correspond to attraction and vice versa.

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